Ntn Corporation

Hiroyuki Noda

Natsuhiko Mori

Tomokazu Sonozaki

Masatoshi Mizutani

Takuji Harano

Tatsuro Sugiyama

Isao Komori

Tetsuya Kurimura

Masaharu Hori

Shinji Miyazaki

Toshiyuki Mizutani

Mika Kohara

Hiroshi Niwa

Kimihiko Bito

Takahiro Okuno

Tomoya Kawai

Hajime Asada

Ikuo Uemoto

The present invention provides a magnetic core having insulating properties, and a method for manufacturing the magnetic core. Provided is a magnetic core manufactured by compression molding and subsequent thermal curing of an iron-based soft magnetic powder having a resin coating formed on particle surfaces thereof. The iron-based soft magnetic powder is one in which the particle surfaces have been coated with an inorganic insulator; the resin coating is an uncured resin coating formed by dry blending the powder with a thermosetting resin at a temperature equal to or greater than the softening point of the thermosetting resin and lower than the thermal curing initiation temperature of the resin; the compression molding is carried out by using a mold to produce a compression molded body; and the thermal curing is carried out at a temperature equal to or greater than the thermal curing initiation temperature of the thermosetting resin.

Magnetic core and method for manufacturing same

A battery checker is provided with: voltage application unit configured to apply an AC voltage to a battery to be measured; ripple voltage measurement unit configured to measure a ripple voltage contained in a terminal voltage of the battery; and electric power storage level detection unit configured to detect an electric power storage level of the battery by comparing the measured ripple voltage with a set reference. The voltage application unit includes a transformer that transforms voltage for an alternating current of an AC power supply such as a commercial AC power supply, and an output circuit that applies, to the battery, an alternating current with transformed voltage.

Battery checker

The present invention provides a magnetic core which can be produced with improved productivity without increasing a material cost and has required magnetic and mechanical properties and a process for producing the same. The magnetic core is produced by compression molding and thereafter thermally hardening iron-based soft magnetic powder having resin films formed on surfaces of particles thereof. The resin film is an uncured resin film formed by dry mixing the iron-based soft magnetic powder and epoxy resin containing a latent curing agent with each other at a temperature not less than a softening temperature of the epoxy resin and less than a thermal curing starting temperature thereof. The iron-based soft magnetic powder having the resin films formed on the surfaces of the particles thereof is compression molded by using a die to produce a compression molded body. The compression molded body having the resin films formed on the surfaces of the particles thereof is thermally hardened at a temperature not less than the thermal curing starting temperature of the epoxy resin.

Magnetic core and process for producing same

Provided is a chip antenna (), including: an antenna pattern (); and a base body (), which has a hexahedral shape, the antenna pattern () including: an antenna part (), which is held on an upper surface of the base body (); and a plurality of terminal parts (), which are held on a lower surface of the base body (), each of the plurality of terminal parts () being soldered to a circuit board (), in which the antenna pattern () further includes a band-shaped protruding part (), which extends in a long-side direction of the antenna part (), and is embedded in the base body (), and the band-shaped protruding part () is provided at least along a range of each of two long sides of the antenna part () excluding a range in which the plurality of terminal parts () are arranged.

Chip antenna

This power transmission device is connected between an AC wiring system connected to an AC power supply, and a DC power supply, and transmits power from the DC power supply to the AC wiring system. The power transmission device includes an AC power supply voltage signal generator, a power converter, a DC voltage conversion unit, a switching element, and a switch open/close signal generator. The switch open/close signal generator includes: a control signal generation unit to generate a control signal formed from a pulse signal; and a pulse width determination unit to receive the control signal and generate a delayed signal obtained by delaying rising of the control signal, and when the delayed signal becomes a value corresponding to a magnitude of voltage of the AC power supply voltage signal, cause the control signal to fall, thereby making the control signal into the switch open/close signal.

Power transmission device

Blade for a vertical turbine rotor

A multiband antenna includes a first antenna unit () and a second antenna unit (). The first antenna unit () includes a first antenna pattern () formed of a conductor and a first substrate () formed of a dielectric, for holding the first antenna pattern (). The second antenna unit () includes a second antenna pattern () formed of a conductor and a second substrate () formed of a dielectric having a dielectric constant different from the dielectric constant of the first substrate (), for holding the second antenna pattern (). In the multiband antenna, by injection molding the second substrate () with the first antenna unit () and the second antenna pattern (), which being insert components, the first antenna unit () and the second antenna unit () are integrated.

Multiband antenna and manufacturing method thereof

Provided is a waveguide tube slot antenna (A), including: a waveguide tube () having a transverse section having a rectangular shape in each part of a waveguide () in an extending direction thereof; and a plurality of radiating slots () arranged in the waveguide tube () at predetermined intervals, in which: the waveguide tube () includes a first waveguide tube forming member () and a second waveguide tube forming member () each having the transverse section having a shape with an end, the first waveguide tube forming member () and the second waveguide tube forming member () being configured to define the waveguide () by being coupled to each other; and the first waveguide tube forming member () is formed to have a flat shape and includes the plurality of radiating slots ().

Waveguide slot antenna and warning system using same

Provided is a waveguide tube slot antenna () including: a plurality of waveguides () arranged in parallel with each other; a plurality of radiating slots () formed along each of the plurality of waveguides (); and a plurality of waveguide tubes () connected in parallel with each other, in which the plurality of waveguide tubes () each include a first waveguide tube forming member () and a second waveguide tube forming member () each having a transverse section having a shape with an end, the first waveguide tube forming member and the second waveguide tube forming member being configured to define one of the plurality of waveguides () by being connected to each other.

Waveguide tube slot antenna and wireless device provided therewith

The invention provides a resin component used within a memory disk drive device and a highly reliable memory disk drive device using the resin component, the resin component having excellent flame resistance and minimal outgas. A resin component used inside a memory disk drive device (), the resin component being an insulating bushing for protecting a lead of a motor () when the lead is connected to a circuit board; a carriage () being molded integrally with a coil for driving a swing arm () provided with a pickup head () for reading or writing information on a memory disk on a distal end thereof, and the carriage adapted for balancing the weight of the swing arm (); or a ramp () for retracting the pickup head () when the memory disk stops.

Memory disk drive device and resin component therefor

A constant-velocity universal joint includes an outer joint member; an inner joint member arranged in an inside of the outer joint member; and torque transmitting members. At least one of the outer joint member and the inner joint member comprises track grooves that are engaged with rolling surfaces of the torque transmitting members. At least one of the components of the constant-velocity universal joint is formed of a metal sintered compact. The metal sintered compact has a relative density of 80% or more and less than 100%. The metal sintered compact comprises a hardened layer formed on a surface thereof through heat treatment. Among the components each formed of the metal sintered compact, a component having a ring shape is subjected to a cold rolling process.

Constant velocity universal joint

An inner peripheral surface and a lower end surface of a bearing sleeve made of a sintered metal are each formed into a smooth cylindrical surface or a flat surface that does not have a dynamic pressure generating portion. Thus, a step of forming the dynamic pressure generating portion can be omitted from a manufacturing step of the bearing sleeve, and cost of dies can be markedly reduced. Further, the inner peripheral surface of the bearing sleeve is formed into the smooth cylindrical surface, and hence a radial dynamic pressure generating portion is formed on an outer peripheral surface of a shaft member. However, the outer peripheral surface of the shaft portion is accessible to tools, and hence the radial dynamic pressure generating portion can be formed easily with high accuracy. As a result, accuracy of a radial bearing gap is enhanced so that a bearing rigidity is enhanced.

Growing community of inventors

Mie, Japan

Hiroyuki Noda